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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - add __sync_val_compare_and_swap_16"
href="http://llvm.org/bugs/show_bug.cgi?id=17481">17481</a>
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<th>Summary</th>
<td>add __sync_val_compare_and_swap_16
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>Backend: X86
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>nlewycky@google.com
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>Compiling this with clang (on a cpu type with the cmpxchg16b feature disabled):
int main(void) { __int128_t a, b, c; __sync_val_compare_and_swap(&a, b, c); }
won me this:
Unexpected value type for atomic!
UNREACHABLE executed at LegalizeIntegerTypes.cpp:1201!
[...]
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module '-'.
4. Running pass 'X86 DAG->DAG Instruction Selection' on function '@main'
clang: error: unable to execute command: Aborted (core dumped)
GCC emits a call to __sync_val_compare_and_swap_16.</pre>
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